Will Renilson replaces his Jersey 36 motor boat shaft seal before aligning the engine with the stern tube. Alas, with a dripless boat shaft seal, you also need to align the engine with the stern tube so that the dripless seal will not leak. We replaced it with a PSS (Proprietary Shaft Seal) seal, as it contains no rubber to burn out and is kept lubricated by taking engine cooling water once the engine is finished with it. Change the stern gland to a Lasdrop DrySeal and store two spare boat shaft seals further up the shaft. Want to read more articles like boat shaft seal repair story?